JP2016157658A - Grommet and cable with grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique which can widen a grommet easily while improving protection performance of the grommet.SOLUTION: A grommet 100 is formed in a tube shape. The grommet 100 includes a bellows part 1 that convex mountain parts 2 formed along a hoop direction and concave valley part 3 formed along the hoop direction range alternately in an extending direction. At the mountain parts 2, multiple thick parts 21 and multiple thin parts 22 thinner than the thick part 21 are formed along the hoop direction and at different positions.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a grommet for protecting an electric wire and an electric wire with a grommet including the grommet.

  The wire harness includes, for example, a plurality of electric wires and connectors. Moreover, the electric wire in a wire harness may be protected by the grommet which covers the circumference | surroundings of a wire harness.

  Here, Patent Document 1 discloses a grommet having a bellows structure. In this grommet, the thickness of the peak portion in the bellows portion is formed to be greater than the thickness of the valley portion.

JP-A-10-297389

  However, in the example shown in Patent Document 1, since the ridge portion formed relatively thick in the bellows portion is formed over the entire circumference, it is difficult to deform the grommet in the direction of expanding the hollow portion. In this case, it is difficult to expand the diameter of the grommet so that a relatively large member such as a connector in the wire harness can be inserted, and there is a concern that it is difficult to insert the wire harness into the grommet.

  An object of this invention is to provide the technique which can expand a grommet easily, improving the protection performance of a grommet.

  The grommet according to the first aspect is formed in a cylindrical shape, and convex ridges formed along the circumferential direction and concave valleys formed along the circumferential direction are alternately arranged in the extending direction. In the mountain portion, a plurality of thick portions and a plurality of thin portions thinner than the thick portions are formed at different positions along the circumferential direction.

  The grommet according to the second aspect is one aspect of the grommet according to the first aspect. In the grommet which concerns on a 2nd aspect, the said thick part is formed by providing a member harder than the said thin part on the surface side.

  The grommet according to the third aspect is one aspect of the grommet according to the first aspect or the second aspect. In the grommet according to the third aspect, the thin portion between the adjacent thick portions is closer to the inner peripheral surface than the circumscribing line connecting the apex portions of the thick portions adjacent in the circumferential direction of the peak portion. It is formed to be located.

  The grommet according to the fourth aspect is the grommet according to any one of the first aspect to the third aspect. In the grommet according to the fourth aspect, in the circumferential direction of the peak part, the protruding part formed to protrude from the outer peripheral side part of the thick part to at least one of both sides and spaced apart from the thin part is the peak part. It is formed in the part.

  The grommet according to the fifth aspect is the grommet according to any one of the first aspect to the fourth aspect. In the grommet which concerns on a 5th aspect, the convex curved surface is formed in the said outer side in the part which protrudes outside including the said thick part in the said peak part.

  The grommet according to the sixth aspect is a grommet according to any one of the first aspect to the fifth aspect. In the grommet according to the sixth aspect, the plurality of thick portions are provided at equal intervals in the circumferential direction.

  The electric wire with a grommet which concerns on a 7th aspect is provided with the grommet which concerns on any one of a 1st aspect to a 6th aspect, and the electric wire penetrated by the said grommet.

  In each of the above aspects, the mountain portion is formed with a plurality of thick portions and a plurality of thin portions having a thickness smaller than the thick portions at different positions along the circumferential direction. In this case, the protection performance improves by the thick part formed in the peak part compared with the grommet which does not contain a thick part. In addition, since the plurality of thick portions are provided at different positions along the circumferential direction of the peak portion, it is difficult to inhibit the bellows portion from being deformed in the direction of expanding the diameter. That is, in each of the above aspects, it is possible to easily expand the grommet while improving the protection performance of the grommet.

  In the second aspect, the thick portion is formed by providing a member harder than the thin portion on the surface side. In this case, the protection performance of the grommet is further improved.

  Further, in the third aspect, the thin portion between the adjacent thick portions is formed on the inner peripheral surface side of the circumscribing line connecting the apex portions of the adjacent thick portions. In this case, since the thin portion can be more reliably protected, the protection performance of the grommet can be further improved.

  Further, in the fourth aspect, in the circumferential direction of the peak portion, the protruding portion that protrudes from the portion on the outer peripheral surface side of the thick portion to at least one of both sides and is spaced from the thin portion is formed on the peak portion. Is formed. In this case, the protruding portion formed on the outer peripheral surface side suppresses the contact between the thin portion and the external member. Further, by forming the inner peripheral surface side to be relatively narrow, it is possible to make the region of the thin portion that is more easily deformed in the circumferential direction of the peak portion relatively large. Therefore, in this aspect, the grommet protection performance is improved, and the bellows portion is easily deformed in the direction in which the diameter is increased.

  Further, in the fifth aspect, a convex curved surface is formed on the outer side in a portion that protrudes to the outside including the thick portion in the mountain portion. In this case, it can suppress that an external member is damaged at the time of contact with this grommet, protecting a bellows part.

  Moreover, in the sixth aspect, the plurality of thick portions are provided at equal intervals in the circumferential direction. In this case, the bellows portion is likely to be deformed so as to expand the overall diameter. For this reason, it becomes possible to expand a bellows part more uniformly.

  Also in the seventh aspect, it is possible to easily expand the grommet while improving the protection performance of the grommet. For this reason, in this electric wire with a grommet, it is easy to perform the operation | work which penetrates an electric wire.

It is a side view of the electric wire with a grommet concerning a 1st embodiment. It is a partial expanded sectional view of the grommet concerning a 1st embodiment. It is sectional drawing of the electric wire with a grommet which concerns on 1st Embodiment. It is sectional drawing of the electric wire with a grommet which concerns on 2nd Embodiment. It is a partial expanded sectional view of the grommet concerning a 2nd embodiment.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not an example of limiting the technical scope of the present invention.

<First Embodiment>
First, the electric wire 110 with a grommet 110 and the grommet 100 according to the first embodiment will be described with reference to FIGS. The grommet-equipped electric wire 110 includes the grommet 100 and the electric wire 4. Grommet 100 is formed in a cylindrical shape and includes bellows portion 1. Moreover, in this embodiment, the attachment part 5 is formed in each of the both ends of the bellows part 1. That is, here, the grommet 100 includes the bellows portion 1 and the two attachment portions 5 provided at both ends thereof.

  FIG. 1 is a side view of the grommet-equipped electric wire 110 of the present embodiment. FIG. 2 is an enlarged cross-sectional view of a part of the bellows portion 1 in the grommet 100. FIG. 2 is a cross-sectional view taken along a line along the extending direction of the grommet 100. 3 is a cross-sectional view taken along a line along a direction orthogonal to the extending direction of grommet 100, and is a cross-sectional view taken along the line II-II in FIG.

  As shown in FIG. 1, the grommet 100 is fixed to the plate-like member 91 by, for example, fitting the attachment portion 5 into a through hole 92 formed in a plate-like member (hereinafter, plate-like member 91). The The plate-like member 91 is assumed to be a vehicle panel, for example. The plate-like member 91 is a member that partitions the space. Further, the through hole 92 is formed to pass the electric wire to the space partitioned by the plate-like member 91. The grommet 100 is fitted into the through hole 92 for the purpose of protecting the electric wire inserted through the through hole 92 from the inner edge of the through hole 92 and waterproofing.

  Further, the grommet 100 may be a resin member such as rubber, for example. Moreover, it is possible that the grommet 100 provided with the bellows part 1 and the attaching part 5 is a member integrally molded by the metal mold | die.

<Grommet: Bellows>
The bellows portion 1 in the grommet 100 is a portion that can be bent relatively easily. In the bellows portion 1, convex ridges 2 formed along the circumferential direction and concave valleys 3 formed along the circumferential direction are alternately formed in the extending direction. .

  In the present embodiment, the peak portion 2 is a portion that is curved and has a convex shape on the outer peripheral surface side of the grommet 100. Further, here, the dimension of the peak portion 2 in the extending direction of the grommet 100 is formed so as to become smaller toward the outer peripheral surface side of the grommet 100. In addition, when the peak part 2 is seen from the inner peripheral surface side of the grommet 100, that is, from the inner peripheral surface side of the grommet 100, the peak part 2 forms a groove whose opening faces the inner peripheral surface side.

  Here, a plurality of thick portions 21 and a plurality of thin portions 22 thinner than the thick portions 21 are formed at different positions along the circumferential direction of the crest portion 2 of the grommet 100.

  In the present embodiment, the thick portion 21 is formed by providing a member harder than the thin portion 22 on the surface thereof. That is, here, the peak portion 2 is composed of two members. The first is a flexible elastic member such as rubber constituting the entire grommet 100. The portion formed by the elastic member is formed over the entire circumference of the peak portion 2. Hereinafter, this flexible part is referred to as a flexible part 29. The second is a resin member that is provided on the outer peripheral surface of the flexible portion 29 and is harder than the flexible portion 29. Hereinafter, this member is referred to as a hard portion 28.

  In the present embodiment, the hard portion 28 is provided, and the portion where the hard portion 28 and the flexible portion 29 overlap is the thick portion 21. That is, here, the thick portion 21 is constituted by two different types of members (flexible portion 29 and hard portion 28). The portion where the flexible portion 29 is exposed, that is, the portion where the hard portion 28 is not provided is the thin portion 22. Therefore, in the present embodiment, the thick portion 21 is formed by providing a member (hard portion 28) harder than the thin portion 22 (flexible portion 29) on the surface side of the thin portion 22.

  The mountain part 2 is provided with a plurality of hard parts 28. Here, as shown in FIG. 3, a case where eight hard portions 28 are provided in one peak portion 2 is shown. That is, in the mountain portion 2, eight thick portions 21 and eight thin portions 22 that are portions between adjacent thick portions 21 are formed. In the present embodiment, a plurality (eight in this case) of thick portions 21 are provided at equal intervals in the circumferential direction of the peak portion 2.

  The hard portion 28 covers a part of the flexible portion 29 in the circumferential direction. The hard part 28 is a part that covers the outer peripheral surface of the flexible part 29 and protects the flexible part 29 from external members. For example, the case where the hard part 28 is formed in a strip shape covering a partial region in the circumferential direction of the flexible part 29 or the case where it is formed in a dot shape covering one point of the flexible part 29 can be considered.

  The hard part 28 is a resin member such as PP (polypropylene) that is harder than rubber. For example, the hard portion 28 may be fixed to the outer peripheral surface of the flexible portion 29 by an adhesive or welding, or may be provided on the outer peripheral surface of the flexible portion 29 by two-color molding.

  In addition, as shown in FIG. 3, in the present embodiment, the adjacent thick portions 21 are located closer to the inner peripheral surface than the circumscribing line P connecting the apexes of the thick portions 21 adjacent in the circumferential direction of the peak portion 2. It is formed so that the thin-walled portion 22 between them is located. That is, the outer portion of the thick portion 21 is positioned so that the entire thin portion 22 between the adjacent thick portions 21 is located closer to the center side of the bellows portion 1 than the outer tangent line P connecting the apex portions of the adjacent thick portions 21. The amount of protrusion, the dimension of the thick portion 21 in the circumferential direction of the peak portion 2, the interval between the thick portions 21, and the like are determined. For example, when it is desired to protect the bellows portion 1 over the entire circumference, it is preferable to provide eight or more thick portions 21 at equal intervals.

  It is conceivable that the circumscribed line P is a straight line along a direction orthogonal to the extending direction of the grommet 100. More specifically, it is considered that the circumscribed line P is a straight line that is in contact with the apex portion of each thick portion 21 adjacent in the circumferential direction of the peak portion 2.

  Thus, in the grommet 100 in which the thin portion 22 exists on the inner peripheral surface side of the outer tangent line P, the contact between the flat portion and the thin portion 22 in the bellows portion 1 is suppressed by a relatively small number of thick portions 21. it can. Further, the thin portion 22 which is a portion where the hard portion 28 is not provided is formed flexibly and can be easily expanded and contracted. For this reason, it becomes possible to expand the bellows part 1 relatively easily by the thin part 22 between the thick parts 21 while protecting the bellows part 1 by the thick part 21.

  Next, the trough 3 connected to the peak 2 in the extending direction of the grommet 100 will be described. In the present embodiment, the valley portion 3 is a portion that forms a concave shape while being curved on the outer peripheral surface side of the grommet 100. That is, the valley 3 is a groove formed over the entire circumference of the bellows 1. Further, here, the dimension of the valley 3 in the extending direction of the grommet 100 is formed so as to become smaller toward the inner peripheral surface side of the grommet 100. In addition, on the inner peripheral surface side of the grommet 100, that is, when the trough portion 3 is viewed from the inner peripheral surface side of the grommet 100, the trough portion 3 protrudes toward the inner peripheral surface side.

  As shown in FIGS. 2 and 3, the trough 3 is constituted by a flexible portion 29 over the entire circumference. The grommet 100 is deformed so that the distance between the adjacent peak portions 2 between the bellows portions 1 in the bellows portion 1 is reduced on the inner side in the bending direction, and is adjacent to the valley portions 3 on the outer side in the bending direction. It becomes possible to bend by deform | transforming so that the distance between the corresponding peak parts 2 may become large.

<Grommet: Mounting part>
In the present embodiment, the attachment portion 5 is formed to be connected to both end portions of the bellows portion 1, and is formed in a shape that can be attached to a counterpart member (here, the plate-like member 91) to which the grommet 100 is attached. It is possible that Here, the attachment portion 5 is formed with a recess 51 that accommodates the inner edge portion of the through hole 92 of the plate-like member 91 and can be fitted along the circumferential direction. The grommet 100 is fixed to the plate-like member 91 by fitting the recess 51 and the inner edge of the through hole 92.

<Wire>
The electric wire 4 is inserted through the grommet 100 of the present embodiment including the attachment portion 5 and the bellows portion 1. It is conceivable that the electric wire 4 is, for example, an insulated wire including a core wire and an insulating coating that covers the periphery of the core wire. For example, the core wire may be a member mainly composed of a metal such as copper or aluminum. The insulating coating may be a synthetic resin member mainly composed of polyethylene or vinyl chloride, for example.

<Electric wire with grommet>
The grommet-equipped electric wire 110 includes the grommet 100 and the electric wire 4 inserted through the grommet 100. Here, as shown in FIG. 3, a case where a plurality of electric wires 4 are inserted through the grommet 100 is shown. Moreover, it is conceivable that the plurality of electric wires 4 are bound by a binding member such as a tape or a band.

  Here, it is conceivable that a relatively large member (not shown) such as a connector is connected to the end of the electric wire 4. In this case, in the operation of inserting the electric wire 4 through the grommet 100, the grommet 100 is arranged in the direction in which the bellows portion 1 expands in order to insert a large member connected to the end of the electric wire 4 into the bellows portion 1 of the grommet 100. May be deformed.

  At this time, the flexible portion 29 made of a flexible member such as rubber is relatively easily deformed. Therefore, the valley 3 can be expanded relatively easily.

  On the other hand, the hard portion 28 is difficult to deform. However, in the present embodiment, the thick portion 21, which is a portion where the hard portion 28 is provided, is formed at different positions along the circumferential direction of the mountain portion 2. That is, the thin wall portion 22 between the thick wall portions 21 adjacent in the circumferential direction of the peak portion 2 is relatively flexible and can be easily expanded and contracted. For this reason, compared with the case where the hard part 28 is formed over the perimeter, the peak part 2 can also be expanded more easily. That is, while protecting the bellows portion 1 with the hard portion 28, the mountain portion 2 can be more easily expanded by the flexible portion 29 between the hard portions 28 adjacent in the circumferential direction of the mountain portion 2.

<Effect>
In this embodiment, the protection performance is improved by the thick portion 21 formed in the peak portion 2 as compared with the grommet not including the thick portion 21. Moreover, since the some thick part 21 is provided in the position which is different along the circumferential direction of the peak part 2, it is hard to inhibit that the bellows part 1 deform | transforms into the direction which diameter-expands. Therefore, in this embodiment, it is possible to easily expand the grommet 100 while improving the protection performance of the grommet 100.

  In the present embodiment, the thick portion 21 is formed by providing a member whose surface is harder than the thin portion 22 (hard portion 28). In this case, the protection performance of the grommet 100 is further improved.

  Moreover, in this embodiment, it forms so that the thin part 22 between the adjacent thick parts 21 may be located in the inner peripheral surface side rather than the circumscribed line P which ties the vertex part of the adjacent thick parts 21. . In this case, in this embodiment, when the contact surface of the external member in contact with the grommet 100 is a flat surface, the external member contacts the hard portion 28 of the thick portion 21, and the thin portion on the inner peripheral surface side thereof 22 (flexible part 29) can be made more reliably in a situation where it does not contact. In this case, since the thin part 22 can be protected more reliably, the protection performance of the grommet 100 can be further improved.

  Moreover, in this embodiment, the some thick part 21 is provided at equal intervals in the circumferential direction. In this case, it is easy to deform | transform so that the bellows part 1 may expand the diameter more entirely. For this reason, it becomes possible to expand the bellows part 1 more uniformly.

  Moreover, also in the electric wire with a grommet of this embodiment, the grommet 100 can be easily expanded while improving the protection performance of the grommet 100. For this reason, in this electric wire 110 with a grommet, the operation | work which penetrates the electric wire 4 is easy to be performed. In the present embodiment, for example, even when a relatively large member (for example, a connector) is connected to the end of the electric wire 4, the operation of inserting the electric wire 4 into the bellows portion 1 of the grommet 100 is performed. Easy to do.

Second Embodiment
Next, the electric wire 210 with grommet 210 and the grommet 200 according to the second embodiment will be described with reference to FIGS. FIG. 4 is a cross-sectional view of the grommet 200. FIG. 4 is a cross-sectional view taken along a line orthogonal to the extending direction of the grommet 200. FIG. 5 is an enlarged cross-sectional view of the vicinity of the thick portion 21A shown in FIG. FIG. 5 is a cross-sectional view taken along a line orthogonal to the extending direction of the grommet 200. 4 and 5, the same components as those shown in FIGS. 1 to 3 are given the same reference numerals.

  The grommet-equipped electric wire 210 includes a grommet 200 and the electric wire 4 inserted through the grommet 200.

  In the grommet 200, a thick part 21A and a peak part 2A having a structure different from that of the first embodiment are formed. In addition, since the trough part 3 and the bellows part 1 in the grommet 200 have the same structure as 1st Embodiment, the description is abbreviate | omitted. Hereinafter, differences of the second embodiment from the first embodiment will be described.

  First, the mountain part 2A different from the first embodiment will be described. In the present embodiment, the peak portion 2A includes, in addition to the thick portion 21A and the thin portion 22, a protruding portion that protrudes from the outer peripheral surface side portion of the thick portion 21A to at least one of both sides in the circumferential direction of the peak portion 2A. 23 is formed. Here, as shown in FIGS. 4 and 5, the peak portion 2 </ b> A is formed with a pair of protruding portions 23 that protrude from the outer peripheral surface side portion of the thick portion 21 </ b> A to both sides.

  In the present embodiment, the thick portion 21 </ b> A and the pair of protrusions 23 are formed by providing the hard portion 28 on the flexible portion 29. Therefore, here, in the cross section cut along the line orthogonal to the extending direction of the grommet 200, the hard portion 28 has a shape including a portion excluding the flexible portion 29 in the thick portion 21A and a pair of protruding portions 23. It is thought that it is formed.

  That is, in the present embodiment, the hard portion 28 is formed with a relatively narrow base side and a relatively wide tip side. And the part formed in comparatively narrowness by the side of the base in the hard part 28 comprises a part in part except the flexible part 29 in the thick part 21A. In addition, the relatively wide portion on the distal end side of the hard portion 28 forms the remaining portion of the thick portion 21 </ b> A excluding the flexible portion 29 and the pair of protruding portions 23. That is, in the present embodiment, it can be said that the hard portion 28 is formed in a T shape.

  In addition, the case where the protrusion part 23 protrudes only in one of the both sides of the thick part 21A is also considered. In this case, it can be said that the hard portion 28 is formed in an inverted L shape. Moreover, the case where the hard part 28 is shapes other than the above is also considered.

  Further, in the present embodiment, the protruding portion 23 is formed with a space from the thin portion 22. More specifically, the pair of protrusions 23 are formed with a gap so that a gap is formed between the surfaces of the thin portions 22 located on both sides of the thick portion 21A in the circumferential direction of the peak portion 2A. Has been. That is, the pair of protrusions 23 are not fixed to the thin portion 22. In this case, it can suppress that a pair of protrusion part 23 inhibits a deformation | transformation of the thin part 22. FIG.

  In the present embodiment, the protruding portion 23 that protrudes from the outer peripheral surface side portion of the thick portion 21 </ b> A to both sides and is spaced from the thin portion 22 does not adhere to the flexible portion 29, and the thin portion of the mountain portion 2 </ b> A. A relatively wide area of the portion 22 (flexible portion 29) can be covered. Thereby, the contact with the thin part 22 which is a part between 21 A of thick parts of the grommet 200, and an external member can be suppressed effectively.

  On the other hand, in the thick part 21A, since the protrusion part 23 is formed in the peak part 2A, the contact area with the outer peripheral surface of the flexible part 29 in the hard part 28 can be made comparatively small. For this reason, the fixed area | region of the hard part 28 and the flexible part 29 can be made comparatively small. As a result, it is possible to prevent the flexible portion 29 from being damaged by the hard portion 28.

  Next, the thick part 21A different from the first embodiment will be described. Here, a convex curved surface is formed on the outer side of the peak portion 2A including the thick portion 21A and projecting to the outside. In the present embodiment, the portion of the ridge 2A that includes the thick portion 21A and protrudes to the outside is a portion that includes the thick portion 21A and the pair of protrusions 23. Here, a portion facing the outside in a portion extending from one of the pair of projecting portions 23 through the thick wall portion 21A to the other of the pair of projecting portions 23 is configured as a curved surface convex to the outside. . As shown in FIGS. 4 and 5, for example, the curved surface is a curved surface in which a cross section cut along a line orthogonal to the extending direction of the grommet 200 is formed in an arc shape along the circumferential direction of the grommet 200. It is possible.

  In the present embodiment, the thick portion 21A is formed by providing the flexible portion 29 with the hard portion 28. Therefore, it is conceivable that a convex curved surface is formed outside the wide portion on the distal end side of the hard portion 28 provided in the flexible portion 29 of the grommet 200. The convex curved surface extending over the thick part 21 </ b> A and the pair of protrusions 23 prevents an external member from being damaged when contacting the thick part 21 </ b> A of the grommet 200. More specifically, since the external member contacts the curved surface, it is possible to prevent the external member from being damaged when contacting the grommet 200 while protecting the thin portion 22.

  Also in the present embodiment, the thick wall portion 21A formed in the peak portion 2 improves its protection performance as compared to a grommet that does not include the thick wall portion 21A. Further, since the plurality of thick portions 21A are provided at different positions along the circumferential direction of the peak portion 2, it is difficult to inhibit the bellows portion 1 from being deformed in the direction of increasing the diameter. Therefore, in the present embodiment, it is possible to easily expand the grommet 200 while improving the protection performance of the grommet 200.

<Application example>
It is conceivable that the thick portions 21 and 21A are made of the same member as the thin portion 22. That is, it is conceivable that the thick portion 21 is a portion formed by one member (flexible portion 29) and formed relatively thick.

  It is also conceivable that the thick portions 21 and 21A are formed only in a partial region of the mountain portion 2 in the circumferential direction. That is, it is conceivable that the thick portions 21 and 21A are intensively provided in the region to be protected in the bellows portion 1. For example, there may be a case where a plurality of thick portions 21 and 21A are provided with an interval only in a region of about a half circumference of the mountain portion 2.

  In addition, the grommet and the electric wire with the grommet according to the present invention can be freely combined with each of the above-described embodiments and application examples within the scope of the invention described in each claim, or each of the embodiments and application examples. It is also possible to configure by appropriately modifying or omitting a part.

DESCRIPTION OF SYMBOLS 1 Bellows part 100 Grommet 2 Mountain part 21 Thick part 22 Thin part 23 Protrusion part 3 Valley part P External tangent

Claims (7)

Formed in a cylindrical shape,
Convex ridges formed along the circumferential direction and concave valleys formed along the circumferential direction include bellows portions that are alternately connected in the extending direction,
A grommet in which a plurality of thick portions and a plurality of thin portions thinner than the thick portions are formed at different positions along the circumferential direction of the mountain portion. The grommet according to claim 1,
The thick part is a grommet formed by providing a member harder than the thin part on the surface side. The grommet according to claim 1 or 2, wherein
It is formed such that the thin portion between the adjacent thick portions is located on the inner peripheral surface side of the circumscribing line connecting the apex portions of the thick portions adjacent in the circumferential direction of the mountain portion, Grommet. The grommet according to any one of claims 1 to 3, wherein
A grommet that protrudes from a portion on the outer peripheral side of the thick portion to at least one of both sides in the circumferential direction of the peak portion, and a protruding portion that is formed at a distance from the thin portion is formed in the peak portion. The grommet according to any one of claims 1 to 4, wherein
A grommet in which a convex curved surface is formed on the outer side at a portion of the mountain portion that includes the thick portion and protrudes to the outside. The grommet according to any one of claims 1 to 5,
The plurality of thick parts are grommets provided at equal intervals in the circumferential direction. The grommet according to any one of claims 1 to 6,
An electric wire with a grommet, comprising: an electric wire inserted through the grommet.

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